While driving in fog, you should

• A. drive with headlights on high beams
• B. pull over and turn off headlights
• C. drive with headlights set on dim, or use fog lights
• D. follow the vehicle ahead at a close distance

Answer: (C)

In fog, visibility is limited because the tiny droplets scatter light. Using high beams sends a strong beam that reflects off the fog back at you, creating glare and making it even harder to see. Driving with headlights on dim, or using fog lights if your vehicle has them, directs light toward the road and helps others see you, reducing glare and improving your own visibility. Turning off headlights would make you hard to see, and following a vehicle too closely is dangerous in reduced visibility since your reaction and stopping distance are both compromised.